The structure present is man but absent in frog is

Options

A. salivary gland
B. pancreas
C. adrenal glands
D. thyroid gland

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a structure that is present in humans (man) but absent in frogs.

2. **Analyzing the Options**: The options given are:
- Salivary gland
- Pancreas
- Adrenal glands
- Thyroid gland

3. **Examining Each Option**:
- **Salivary Gland**: Humans have salivary glands that produce saliva, which aids in digestion. Frogs, on the other hand, do not have salivary glands because they do not chew their food; they swallow it whole without mastication.
- **Pancreas**: Both humans and frogs have a pancreas, which produces digestive enzymes.
- **Adrenal Glands**: Both species possess adrenal glands that produce hormones.
- **Thyroid Gland**: The thyroid gland is present in both humans and frogs, playing a role in metabolism.

4. **Conclusion**: The only structure that is present in humans but absent in frogs is the salivary gland.

5. **Final Answer**: The structure present in man but absent in frog is the **salivary gland**.